boy scout

A boy or man who is exceptionally honest, scrupulous, and rule-abiding, especially to an excessive or irritating degree. A reference to the Scout movement, which teaches its members to be upstanding, trustworthy, and honest. A: "Hey, we're not supposed to leave our desk while the teacher is away!" B: "Oh, don't be such a boy scout, Timmy." Look, I know you're a real boy scout, Sameer, but sometimes you have to bend the rules to get things done in this business, capiche? He's a total boy scout, so there's no way he's gonna help you with the senior prank.